ICP 3.1.x and 3.2.x - Mongo backup and restore - cert permissions and host parameter

[niv-ibm]

This applies to both icp-mongodb-mongodump-job.yaml and icp-mongodb-mongorestore-job.yaml .

1. Mounted secret permissions are 400 and cant be read by the nobody user running the newer mongodb image - this can be resolved by changing the secrets to defaultMode: 0444.

2. The pod command uses cat to combine the certs and place them in /, however, the user can't write to /, changing to a writable dir such as /tmp fixes this

3. The mongorestore command flag --host should be rs0/mongodb:$MONGODB_SERVICE_PORT, otherwise you receive an error Failed: no reachable servers